Answers are grounded in this paper and cite their sources.
The divergence of underdamped-mode linewidth in the vicinity of structural phase transition is treated by the usual anharmonic theory, renormalized to account for the actual temperature dependence of the soft phonon frequencies that enter the damping term. Results are found to fit satisfactorily damping data of A2 and E modes in quartz.
No takes yet. Share an insight, caveat, or question.
François Gervais (1976) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: